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Case Study: Resolving Cross-Cannibalisation in a Multi-Campaign Google Ads Account (EdTech Industry)

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Background

An EdTech company offering live courses and upskilling programs was running multiple Google Ads campaign types simultaneously — including Search, Performance Max (PMax), and Demand Gen. Over time, the account faced performance inconsistencies:

  • Branded Search campaigns saw a drop in impressions and conversions.

  • Cost per acquisition (CPA) rose with unclear attribution.

  • Multiple campaigns were targeting the same user base, creating overlap and inefficiencies.

Challenge

The core issue was cross-cannibalisation — multiple campaigns were bidding on similar keywords, audiences, or placements, resulting in:

  • Internal competition for the same users.

  • Inflated CPCs.

  • Diluted campaign insights.

  • Difficulty scaling while maintaining profitability.

Strategy & Solution

To address this, I restructured the Google Ads account using a layered, funnel-based approach to separate intent, audience, and goals across campaign types:

🔧 Campaign Structuring & Execution

1. Search Campaign Optimisation

  • Used exact match targeting for high-intent and branded queries to preserve control over Search campaigns.

  • Created custom negative keyword lists and shared them with the PMax campaign via a Google Ads representative to prevent brand traffic hijacking.

  • Split non-brand and brand search campaigns to isolate performance and bidding.

2. Performance Max (PMax) Control & Segmentation

  • Separated PMax into two campaigns:

    • Conversion-focused PMax for hot leads.

    • Prospecting-focused PMax with cold audience signals (e.g., interests, demographics).

  • Created distinct asset groups based on product categories (e.g., tech courses, career prep) to improve audience segmentation and reduce overlap.

  • Excluded customer lists (e.g., past converters) from top-of-funnel campaigns to avoid redundancy.

3. Demand Gen Differentiation

  • Developed custom intent audiences focused on upper-funnel users (e.g., users interested in career growth, skill-building).

  • Applied audience exclusions to ensure Demand Gen didn’t remarket to users already targeted in PMax or Search.

  • Crafted unique video and visual creatives to align with the platform and audience stage.

4. Attribution & Reporting Enhancements

  • Implemented GA4 audience overlap reports to monitor and adjust targeting.

  • Used labelling in Google Ads (Top, Mid, Bottom Funnel) for clearer performance tracking.

  • Monitored Search Term Insights in PMax and regularly reviewed shared impressions with Search campaigns.

Results After Restructuring

  • 📉 Branded Search impressions increased by 40%, with a 28% drop in CPA.

  • ⚖️ Balanced traffic distribution between Search and PMax, ensuring better budget allocation.

  • 🔍 Improved attribution clarity, allowing smarter budget shifts between prospecting and retargeting.

  • 🎯 Demand Gen delivered 23% higher CTR after excluding overlap and refreshing creatives.

Conclusion

By proactively managing audience overlaps, keyword bidding conflicts, and creative differentiation, I successfully reduced internal competition, improved campaign performance, and scaled effectively across the funnel in a complex Google Ads environment. This structure now serves as a scalable model for similar multi-channel accounts in the EdTech and online learning space.

Pavithra

Writer & Blogger

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